Kieron Gillen's Doctor Aphra series will be running into the main Jason Aaron penned Star Wars series for a horror based cross over story called the "Screaming Citadel". The Screaming Citadel will have 5 parts crossing between a Screaming Citadel one shot, Doctor Aphra and Star Wars.

While there have been many Star Wars monsters making appearances in stories I can't say that there have been true horror based stories. I think this promises to be really different. If that is not enough to get you interested there is this: A team up between Luke Skywalker and Doctor Aphra. I really don't know what that team up looks like and that is kind of exciting. Its a crazy pairing of two characters I like a lot but who are very different.

The story is said to feature a Star Wars symbiote. The symbiote's were mentioned in Doctor Aphra 1 where she black mailed a professor who had been studying the deadly creatures. She had then stole them and placed them in what was an empty vault in the planet she had been studying. The symbiote created a archeological furor of interest and propelled Doctor Aphra's name. However, her father discovered that her research was nothing but a hoax and who knows who else.

Now these symbiotes appear again!

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Quotes from Jason Aaron and Kieron Gillen from Bleeding Cool:
Jason Aaron says of the series:

It starts with Aphra and Luke together, which is a pairing we didn’t really see at all in Vader Down, and that really drives this story. That’s probably been the most fun part for me, so far — reading what Kieron did with those two characters together and then carrying on from that. It starts with them venturing into a very dark and scary situation on a faraway alien planet and winding up in the clutches of a sinister alien queen. There’s symbiotes involved. There are Aphra’s two murderous droids and best-friend Wookiee, and then, of course, the cast of my book. Han and Leia and Sana Starros come running into the fray, as well, and there are several new villains who are at play.

Gillen says that:

The trick is, we’re going to do this quite-hard twist, as in we’re going to lean very much to this particular genre that we haven’t seen in Star Wars before, and that’s a big part of the appeal. “Let’s do a horror story, and let’s do a horror story with this level of gothic fantasy to it.” It pretty much starts in a bar, which is as Star Wars as it gets. So it’s very grounded, we recognize it’s Star Wars. Then we travel with Luke and Aphra, and we go to this place. It’s instantly a Star Wars take on the trope of doing a village, and there’s a really weird castle up on the hill and it’s a bit suspicious, and they arrive there and [the people] seem very friendly but something is definitely off. You know what I mean? You understand the tropes, then you go, “Okay, how can we make them feel like Star Wars?” That’s putting the twist on it. In terms of the horror aspects of the book, which I’m being a bit sheepish around, it’s like, “How can get something that feels like that, but then also, definitely, is not just doing that in Star Wars.”